Sample warper with idle running preventing mechanism of yarn guide

ABSTRACT

There is provided a sample warper with an idle running preventing mechanism of a yarn guide, wherein yarns are automatically exchanged and successively wound on the warper drum according to a preset yarn order by passing the yarns between the yarn guides and the yarn selection guides, and wherein, when a first yarn being wound on the warper drum by a first yarn guide is exchanged to a second yarn, after a yarn removing operation for removing the first yarn from the first yarn guide is finished, a yarn feeding operation for feeding the second yarn to a second yarn guide is performed while the empty first yarn guide makes one rotation. The sample warper can achieve such an advantage that an idle running time of a yarn guide when exchanging yarns can be reduced considerably and a speed of yarn exchanging is improved remarkably.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a sample warper with an idle runningpreventing mechanism of a yarn guide which has a plurality of yarnguides for winding yarns on a warper drum and automatically exchangesyarns in a preset yarn order to wind the yarns on the warper drum,wherein yarns to be wound can be very effectively exchanged by utilizingthe plural yarn guides, and a high speed warping method.

2. Description of the Related Art

As a sample warper used conventionally, for example, there has beenknown a structure disclosed in Japanese Patent No. 1529104, namely, astructure where using a fixed creel for supporting a plurality ofbobbins on which different kinds (different colors or twisteddifferently) of yarns are to be wound, the yarns are successively woundon a warper drum by yarn guides while yarn exchanging is performed byyarn selection guides according to preset pattern data (a yarn order).

Further, there has been also known a sample warper for winding aplurality of yarns simultaneously, wherein by using a rotary creel andomitting a yarn exchanging step, it is possible to cancel loss of timefor yarn exchanging, to wind simultaneously a plurality of yarns on awarper drum, and further to reduce a warping time (refer to JapanesePatent No. 1767706, U.S. Pat. No. 4,972,662 and EP375480).

The fixed creel has a plurality of bobbins on which the same kind and/ordifferent kinds (mainly different kinds) of yarns are to be wound,wherein since yarns can be warped for each yarn while yarn exchanging isfreely performed by the selection device, a warping operation forpattern warping can be advantageously performed, but since yarns aresequentially wound on the warper drum for each yarn, much time isdisadvantageously required for a warping operation. On the other hand,the rotary creel has a plurality of bobbins on which the same kindand/or different kinds of yarns are to be wound, and it can be appliedto repetition warping for an extremely limited number of patterns suchas solid color warping (for example, one color of a red color yarn), oneto one warping (for example, repetition of one red yarn and one whiteyarn, or repetition of one S-twisted yarn and one Z-twisted yarn), twoto two warping (for example, repetition of two red yarns and two whiteyarns, or two S-twisted yarns and two Z-twisted yarns) and the like. Inthe rotary creel, a warping operation for pattern warping except for theextremely limited number of patterns can not be disadvantageouslyperformed but a warping time can be advantageously reduced to a greatextent because the plural yarns are wound on the warper drumsimultaneously.

The present applicant has already proposed a sample warper provided witha plurality of yarn selection devices corresponding to a fixed creel anda rotary creel, which can perform jointly pattern warping and repetitionwarping and reduce a warping time of a warping operation requiring solidcolor warping and pattern warping to achieve an extremely highefficiency (refer to JP2000-136456A and EP933455A2).

Further, the present applicant has also proposed a novel yarn removingmechanism that can prevent a yarn from loosing in the above-describedsample warper to perform yarn exchanging efficiently (refer toJP11-293536A, EP955399A2 and U.S. Pat. No. 5,970,591).

As described above, conventionally, research and improvement have beenalready conducted regarding the yarn loosening prevention whenexchanging yarns in a sample warper. However, yarn exchanging using afixed creel in a current sample warper (that is, feeding a yarn from ayarn selection guide to a yarn guide, or storing a yarn from the yarnguide to the yarn selection guide) has been performed by using one yarnguide in a sample warper having one yarn guide, or by selecting one yarnguide to be used in a sample warper having a plurality of yarn guides.

In such a sample warper, for example, when yarn exchanging is performedfrom a red yarn to a white yarn, a yarn guide must perform idle runningof at least one rotation between storing of a yarn and feeding ofanother yarn in order that the red yarn is removed from the yarn guideto store the removed red yarn in a yarn selection guide for the red yarnand the white yarn is fed from a selection guide for the white yarn tothe yarn guide.

In recent years, as fabric design becomes complicated, the number ofyarn exchanging increases remarkably, so that a ratio of a total idlerunning time of the yarn guide during yarn exchanging increases to thewarping operation time. Therefore, it has been required to provide ayarn exchanging mechanism where the idle running time of the yarn guidehas been reduced to the least possible level.

SUMMARY OF THE INVENTION

The present inventors have solved the above-described problem and havereached to the present invention as a result of the repeated researchabout a mechanism for reducing the idle running time of the yarn guideduring yarn exchanging to the least possible level.

A first object of the present invention is to provide a sample warperwith an idle running preventing mechanism of a yarn guide which canreduce an idle running time during yarn exchanging to the least possiblelevel so as to improve a speed of yarn exchanging remarkably and hencecan shorten a warping time largely as compared with a case of using aconventional yarn exchanging mechanism where an idle running isperformed.

A second object of the present invention is to provide a high speedwarping method which realizes a sharp increase in warping rate and canreduce an idle running time of a yarn guide to the least possible toperform yarn exchanging while maintaining a high warping rate, that is,without lowering the warping rate, thereby reducing the warping timeconsiderably.

In order to solve the above problem, according to a first aspect of thepresent invention, there is provided a sample warper with an idlerunning preventing mechanism of a yarn guide comprising: a plurality ofyarn guides each rotatably mounted on a side surface of a warper drumfor winding yarns on the warper drum; a yarn selection device providedwith a plurality of yarn selection guides which are in correspondencewith the yarn guides, each of the yarn selection guides being pivotallymoved to project to a yarn exchanging position when exchanging yarns andretract to a standby position when storing yarns; a fixed creel forsupporting a plurality of bobbins on which the same kind and/ordifferent kinds of yarns are to be wound and which are in correspondencewith the plural yarn selection guides; and yarn removing guides whichare provided such that one of the yarn removing guides corresponds toeach of the plural yarn selection guide, wherein yarns are automaticallyexchanged and successively wound on the warper drum according to apreset yarn order by passing the yarns between the yarn guides and theyarn selection guides, and wherein, when a first yarn being wound on thewarper drum by a first yarn guide is exchanged to a second yarn, after ayarn removing operation for removing the first yarn from the first yarnguide is finished, a yarn feeding operation for feeding the second yarnto a second yarn guide is performed while the empty first yarn guidemakes one rotation.

When yarn exchanging is performed from a yarn of the yarn selectionguide positioned downstream of the yarn selection device to a yarn ofthe yarn selection guide positioned upstream of the yarn selectiondevice, the yarn guide positioned downstream of the first yarn guide ispreferably used as the second yarn guide. After a yarn removingoperation for removing the first yarn from the first yarn guide isfinished, a yarn guide which has first reached the position of the yarnselection guide which supplies the second yarn is preferably used as thesecond yarn guide.

According to a second aspect of the present invention, there is provideda sample warper with an idle running preventing mechanism of a yarnguide comprising: a plurality of yarn guides each rotatably mounted on aside surface of a warper drum for winding yarns on the warper drum; ayarn selection device provided with a plurality of yarn selection guideswhich are in correspondence with the yarn guides, each of the yarnselection guides being pivotally moved to project to a yarn exchangingposition when exchanging yarns and retract to a standby position whenstoring yarns; a fixed creel for supporting a plurality of bobbins onwhich the same kind and/or different kinds of yarns are to be wound andwhich are associated with the plural yarn selection guides; and yarnremoving guides which are provided such that one of the yarn removingguides corresponds to each of the plural yarn selection guide, whereinyarns are automatically exchanged and successively wound on the warperdrum according to a preset yarn order by passing the yarns between theyarn guides and the yarn selection guides, and wherein, when a firstyarn being wound on the warper drum by a first yarn guide is exchangedto a second yarn, after a yarn feeding operation for feeding the secondyarn to a second yarn guide is finished, a yarn removing operation forremoving the first yarn from the first yarn guide is performed while thesecond yarn guide holding the second yarn makes one rotation.

When yarn exchanging is performed from a yarn of the yarn selectionguide positioned upstream of the yarn selection device to a yarn of theyarn selection guide positioned downstream of the yarn selection device,the yarn guide positioned upstream of the first yarn guide is preferablyused as the second yarn guide. A yarn guide positioned upstream in arotational direction of and adjacent to the first yarn guide ispreferably used as the second yarn guide.

According to a third aspect of the present invention, there is a samplewarper with an idle running preventing mechanism of a yarn guidecomprising: a plurality of yarn guides each rotatably mounted on a sidesurface of a warper drum for winding yarns on the warper drum; a yarnselection device provided with a plurality of yarn selection guideswhich are in correspondence with the yarn guides, each of the yarnselection guides being pivotally moved to project to a yarn exchangingposition when exchanging yarns and retract to a standby position whenstoring yarns; a fixed creel for supporting a plurality of bobbins onwhich the same kind and/or different kinds of yarns are to be wound andwhich are associated with the plural yarn selection guides; and yarnremoving guides which are provided such that one of the yarn removingguides corresponds to each of the plural yarn selection guide, whereinyarns are automatically exchanged and successively wound on the warperdrum according to a preset yarn order by passing the yarns between theyarn guides and the yarn selection guides, and wherein, when a firstyarn being wound on the warper drum by a first yarn guide is exchangedto a second yarn, a yarn removing operation for removing the first yarnfrom the first yarn guide and a yarn feeding operation for feeding thesecond yarn to a second yarn guide are performed simultaneously.

The yarn selection guides may be grouped into a plurality of groups andarranged. By arranging the grouped yarn selection guides according tospaces among the plural yarn guides and assigning arrangement of theplural yarn guides to the grouped yarn selection guides, the samplewarper of the third aspect according to the present invention can beimplemented

A warping method of the present invention uses each of theabove-described sample warpers and reduces a time period required forthe yarn exchanging is reduced to the least possible level.

According to the sample warper with an idle running preventing mechanismof a yarn guide of the present invention, such an advantage can beachieved that an idle running time of a yarn guide when exchanging yarnscan be reduced considerably and a speed of yarn exchanging is improvedremarkably, and the warping time can be reduced largely as compared witha case of using the conventional yarn exchanging mechanism where an idlerunning of the yarn guide is performed.

According to the high speed warping method of the present invention,such an advantage can be achieved that much increase in warping speed isrealized and yarn exchanging can be performed while maintaining a highwarping speed, namely without lowering the warping speed, and thewarping time can be reduced largely.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic explanatory side view showing a structural exampleof a sample warper of the present invention;

FIG. 2 is a schematic explanatory plan view of FIG. 1;

FIG. 3 is a schematic explanatory front view of FIG. 1;

FIG. 4 is a schematic explanatory view of an essential portion showingan example of a yarn selection device;

FIG. 5 is a schematic explanatory view showing an action of the yarnselection device, wherein a yarn selection guide holding a yarn has beenpivotally moved to a yarn exchanging position;

FIG. 6 is a perspective view of an essential portion showing an exampleof a moving type yarn guide;

FIG. 7 is a bottom view of FIG. 6;

FIG. 8 is an explanatory view showing a relationship among intervals L₁and L₂ between respective yarn guides in a plurality of yarn guides, awidth L_(a) of a yarn selection device and a width L_(d) betweenrespective yarn selection guides; and

FIG. 9 is a schematic explanatory front view showing another structuralexample of a sample warper of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Embodiments of the present invention will be explained below withreference to the attached drawings. It is apparent that the presentinvention will be modified variously from the illustrated embodimentswithout departing from the technical idea of the present invention.

In FIGS. 1 to 3, reference numeral 200 denotes a sample warper accordingto the present invention that has a basic structure and function incommon with the conventional sample warper except for a characteristicstructure and function according to the present invention, which will bedescribed later.

As illustrated, like the above-described conventional sample warper, thesample warper 200 of the present invention comprises a plurality of yarnguides 6 a to 6 h (the number of the yarn guides is not limited to aspecific number, but eight of the yarn guides are shown in theillustrated embodiment), each of which is rotatably mounted on a sidesurface of a warper drum 208 for winding yarns 22 on the warper drum208, and a yarn selection device 27 provided with a plurality of yarnselection guides 27 a to 27 j which are mounted in correspondence withthe yarn guides 6 a to 6 h on an end portion of a base 210 supportingthe warper drum 208, each of the yarn selection guides 27 a to 27 jbeing pivotally moved to project to a yarn exchanging position whenexchanging yarns and retract to a standby position when storing yarns,wherein yarns 22 are automatically exchanged and successively wound onthe warper drum 208 according to a preset yarn order by passing theyarns 22 between the yarn guides 6 a to 6 h and the yarn selectionguides 27 a to 27 j. In this case, reference numerals 7 a to 7 h denoteguide pieces which are provided at distal ends of the yarn guides 6 a to6 h for performing yarn catching and yarn holding.

In FIG. 1, reference numeral 79 denotes a controller; 212, a yarn changeportion; 214, a side cover; 216, a view window, and 218, a drivingportion.

As illustrated in FIG. 1 and FIG. 2, in the sample warper 200 of thepresent invention, a fixed creel 202 for supporting a plurality ofbobbins 110 which are associated with the plural yarn selection guides27 a to 27 j and on which yarns of different yarns (yarns with differentcolors or yarns twisted differently) have been wound.

The yarns 22 of the fixed creel 202 are respectively stored in theplural yarn selection guides 27 a to 27 j and can be sequentially woundon the warper drum 208.

The fixed creel 202 comprises a bobbin stand 102 and a creel stand 104.The bobbin stand 102 has a bobbin frame 108 provided with casters 106 ona lower surface thereof. A suitable number of the bobbins 110 aremounted on a back end side of the bobbin frame 108. Guide plates 112 areprovided ahead of the bobbins 110, respectively.

As illustrated in FIG. 1, since a leading end of a yarn 22 m beingwarped is wound on the warper drum 208 via the yarn guide 6, the tensionof the yarn 22 m fluctuates and a drop ring 124 moves up and downaccording to the fluctuation. On the other hand, a yarn 22 n beingsuspended (a yarn stored in the yarn selection device 27) is storedinside the yarn selection device 27 in a state that a drop ring 124 hasfallen into the lowest position.

Reference numeral 17 denotes a plurality of conveyor belts movablymounted on a circumferential surface of the warper drum 208, and a feedrate of the conveyor belt 17 is controlled by a conveyor belt feed meansaccording to warping conditions (the number of yarns to be warped, thewidth to be warped, the winding number of yarns to be warped and thelike). The movement of the conveyor belts is synchronous with rotationof the yarn guides. Reference numerals 33, 34, 38 a and 38 b denoteshedding bars, and 35 and 37 denote cut shedding bars. Shedding means(not shown) are provided on distal end portions of the shedding bars 33to 35, 37, 38 a and 38 b on the side of the yarn guides, and a shed of ayarn can be formed by the shedding means. Incidentally, the basicstructure and function of the sample warper 200 are well known from theabove-described patent publications and the others, and hence thedetailed explanation thereof will be omitted.

As the above-described yarn selection device 27, one described inJP11-293536A, for example, shown in FIG. 4 and FIG. 5 can be used. InFIG. 4 and FIG. 5, the yarn selection device 27 has a plurality of yarnselection guides 27 a to 27 h (the yarn selection guides 27 d to 27 fare shown in FIG. 4, and the yarn selection guide 27 a is shown in FIG.5), and each of the yarn selection guides 27 a to 27 h is pivotallymoved to an operation position (a yarn exchanging position) or asuspended position (a standby position) by a corresponding selectionsolenoid 29 of a rotary solenoid so as to put the yarn 22 in and out.

Yarn removing guides 136 a to 136 h (in the illustrated embodiment, theyarn removing guides 136 e to 136 g are shown in FIG. 4 and the yarnremoving guide 136 a is shown in FIG. 5) are provided such that each ofthe yarn removing guides 136 a to 136 h forms a pair with correspondingone of the yarn selection guides 27 a to 27 h. Each of the yarn removingguides 136 a to 136 h is pivotally moved to an operation position (ayarn removing position) or a suspended position (a standby position) bya yarn removing solenoid 138 provided in proximity to the selectionsolenoid 29 to perform a yarn removing operation. In FIG. 4 and FIG. 5,reference numeral 16 denotes a drum spoke; 59, a front cover; 59 a, afront guide rod; and 212, a yarn change portion.

As the yarn selection device 27, besides the device shown in FIG. 4 andFIG. 5, there may be also used a yarn selection device having astructure provided with conventionally known yarn removing members asseparate members.

As the plural yarn guides 6 a to 6 h, fixed type yarn guides can beused, but it is preferable to use movable type yarn guides. As themovable type yarn guides, those described in JP2002-30536A, for example,shown in FIG. 6 and FIG. 7 may be used. The movable type yarn guides 6 ato 6 h are provided with arm portions 308 and guide pieces 7 a to 7 hwhich are rotatably provided at distal end portions of the arm portions308 and can hold yarns, as illustrated in FIG. 6 and FIG. 7 (only themovable yarn guide 6 a is shown).

A holder portion 312 is provided at a distal end portion of the armportion 308, and a cylinder base 314 is continuously attached to theholder portion 312. The cylinder base 314 is provided with a rotary aircylinder 316 having a swinging shaft 316 a, and a guide piece 7 a isfixed to the swinging shaft 316 a and is rotatable together with theswinging shaft 316 a. Reference numerals 318 a and 318 b denote airtubes mounted so as to communicate with the rotary air cylinder 316, andcompressed air is supplied from an unillustrated solenoid valve into therotary air cylinder 316.

For example, when compressed air is supplied from the air tube 318 ainto the rotary air cylinder 316, the guide piece 7 a is rotated in onedirection, for example, to a position indicated by a solid line in FIG.7, that is to say, projected to the yarn holding position to serve asthe yarn guide. On the other hand, when compressed air is supplied fromthe air tube 318 b into the rotary air cylinder 316, the guide piece 7 ais rotated in the other direction, for example, to a position indicatedby an imaginary line in FIG. 7, that is to say, retracted to a positionwhere the guide piece 7 a does not hold a yarn, so that the guide piece7 a does not serve as the yarn guide. In FIG. 7, reference numerals 320and 320 indicated by an imaginary line denote stoppers which serve tolimit a rotation range of the guide piece 7 a.

The sample warper of the present invention comprises: the plural yarnguides 6 a to 6 h which wind the yarns 22 on the warper drum 208; theplural yarn selection guides 27 a to 27 j which are mounted on an endportion of the base 210 supporting the warper drum 208 in correspondencewith the yarn guides 6 a to 6 h and each of which is pivotally moved toproject to a yarn exchanging position when exchanging yarns and retractto a standby position when storing yarns; the fixed creel 202 providedin correspondence with the plural yarn selection guides 27 a to 27 j andfor supporting the plural bobbins 110 on which yarns of the same kindand/or different kinds have been wound; the yarn removing guides 136 ato 136 j each provided in correspondence with each of the plural yarnselection guides 136 a to 136 j, wherein the yarns 22 are automaticallyexchanged and successively wound on the warper drum 208 according to apreset yarn order by passing the yarns between the yarn guides 6 a to 6h and the yarn selection guides 27 a to 27 j, wherein, when yarnexchanging is performed, a yarn removing operation for removing thefirst yarn (red), for example, the yarn 22 a from the first yarn guide,for example, the yarn guide 6 a winding the first yarn 22 a on thewarper drum 208 and a yarn feeding operation for feeding the second yarn(white), for example, the yarn 22 b to the second yarn guide 6 b areperformed while a reference yarn guide first subjected to the yarnremoving operation or the yarn feeding operation and selected fromeither of the two yarn guides 6 a, 6 b makes one rotation.

Modes of yarn exchanging in the present invention are as follows: (1)after the yarn removing operation is finished, the yarn feedingoperation can be performed; (2) after the yarn feeding operation isfinished, the yarn removing operation can be performed, and (3) the yarnremoving operation and the yarn feeding operation can be performedsimultaneously.

(1) The mode where after the yarn removing operation is finished, theyarn feeding operation is performed, for example, the first yarn 22 a isremoved from the first yarn guide 6 a winding the first yarn 22 a andthe second yarn guide 6 b catches the second yarn 22 d is performed inthe following manner. The first yarn 22 a is first removed from thefirst yarn guide 6 a winding the first yarn 22 a on the warper drum 208by having the first yarn 22 a caught on the yarn removing guide, forexample, the yarn removing guide 136 a, and the caught first yarn 22 ais passed to the corresponding yarn selection guide 27 a to be stored.Next, while the empty first yarn guide 6 a (in this case, the first yarnguide 6 a which is first subjected to the yarn removing operation, andthe first yarn guide 6 a serves as the reference yarn guide) makes onerotation, the second yarn 22 d is fed from the yarn selection guide 27 dstoring the second yarn 22 d to the second yarn guide 6 b, and thesecond yarn 22 d is wound on the warper drum 208 in a state that thesecond yarn 22 d has been held by the second yarn guide 6 b. Byperforming such yarn exchanging, a time period from removing the firstyarn 22 a from the first yarn guide 6 a to holding the second yarn 22 dby the second yarn guide 6 a is considerably short, so that an idlerunning state of the yarn guide (in a state that none of the yarn guides6 a to 6 h holds the yarns 22) can be avoided to the utmost.

In the mode (1) described above, by utilizing as the second yarn guide ayarn guide which first passes through after the state that the yarnselection guide 27 d feeds the second yarn 22 d has been realized, anidle running time of the empty first yarn guide 6 a may be reduced tothe minimum. It is most preferable that a yarn guide provided adjacentto and downstream of the first yarn guide 6 a, for example, the yarnguide 6 b in FIG. 3 is used as the second yarn guide because the idlerunning time may be reduced to the minimum. However, in order to allowutilization of the yarn guide 6 b as the second yarn guide, asillustrated in FIG. 8, it is required that a length L₁ of an arc formedby the yarn guide 6 a and the yarn guide 6 b is larger than aninstallation width L_(a) of the yarn selection device 27 (that is, atotal installation width L_(a) of all the yarn selection guides 27 a to27 j), namely, L₁>L_(a). If L₁<L_(a), the yarn guide 6 b can not be usedas the second yarn guide; a length L₂ of an arc formed by the yarn guide6 a and the yarn guide 6 c is further compared with the installationwidth L_(a) of the yarn selection device 27, and if L₂>L_(a), the yarnguide 6 c can be used as the second yarn guide. If L₂<L_(a), a yarnguide forming a further larger arc is selected to be used similarly. Infact, when a relationship between an installation width between one ofthe yarn selection guides 27 a to 27 j first used and one of the yarnselection guides 27 a to 27 j next used, for example, L_(d) (theinstallation width between the yarn selection guides 27 a and 27 d inthe example shown in FIG. 8) and the above-described L₁, L₂ meets L₁,L₂>L_(d), it is possible to implement the yarn exchanging mode (1) inthe present invention. If L₁ or L₂>L_(a), all the yarn selection guides27 a to 27 j can be advantageously utilized.

Regarding the mode (1), more specifically speaking, for example, when ayarn being warped by the first yarn guide 6 a is a yarn of the yarnselection guide 27 a (the yarn 22 m in the example shown in FIG. 2), anyone of the yarn guides 6 b to 6 h can be used as the second yarn guide,but the yarn guide 6 b is the most preferable second yarn guide. As ayarn to be fed to the second yarn guide of the yarn guides 6 b to 6 h,any one of the yarns stored in the yarn selection guides 27 b to 27 h(the yarns 22 n in the example shown in FIG. 2) may be used. In the mode(1) where the yarn exchanging is performed from the yarn guide 6 a tothe yarn guide 6 b, it is sufficient for the yarn guide 6 a to make ⅛rotation of idle running as compared with the conventional mode whereafter the yarn guide 6 a has made one rotation of idle running, the yarnexchanging is performed.

(2) The mode where after the yarn feeding operation is finished, theyarn removing operation is performed, for example, the empty second yarnguide 6 a catches the second yarn 22 a and the yarn 22 d is removed fromthe first yarn guide 6 b winding the first yarn 22 d is performed in thefollowing manner. First, the second yarn 22 a is fed to the second yarnguide 6 a, and the second yarn 22 a is held by the second yarn guide 6 aand wound on the warper drum 208. Next, while the second yarn guide 6 a(in this case, a yarn guide which is first subjected to yarn feeding isthe second yarn guide 6 a, and the second yarn guide 6 a serves as thereference yarn guide) makes one rotation, the first yarn 22 d is removedfrom the first yarn guide 6 b winding the first yarn 22 d on the warperdrum 208 by having the first yarn 22 d caught on the yarn removingguide, for example, 136 d, and the first yarn 22 d is passed and storedto a corresponding yarn selection guide 27 d. Even when such yarnexchanging is performed, a time period from the second yarn 22 a beingfed and held to the second yarn guide 6 a to the first yarn 22 d beingremoved from the first yarn guide 6 b is considerably short, so that anidle running state of the yarn guide can be avoided to the utmost. Inthe mode (2), the yarn selection guide storing a yarn to be first fed ispreferably positioned on an upstream side of the yarn guide in arotational direction thereof. In such a constitution, it is requiredthat the second yarn guide 6 a is positioned on the upstream side of thefirst yarn guide 6 b in the rotational direction thereof, but arelationship in size between the width L_(a) of the selection device 27and the widths L₁, L₂ of arcs among the yarn guides 6 a to 6 h causes noproblem. Incidentally, even in the mode (2), such a constitution can beemployed that the yarn selection guide storing a yarn to be first fed ispositioned on a downstream side in the rotational direction of the yarnguide. In case of this constitution, the above-described relationship ofL₁ or L₂>L_(d) may be enough in order to remove the second yarn 22 dfrom the first yarn guide 6 b, but if L₁ or L₂>L_(a) is met, all of theyarn selection guides 27 a to 27 j can be advantageously utilized likethe mode (1).

Further, regarding the mode (2), more specifically speaking, forexample, when a yarn being warped by the first yarn guide 6 b is a yarnof the yarn selection guide 27 h, it is preferable to use the yarn guide6 a as the second yarn guide. As the yarn fed to the second yarn guide 6a, any one of yarns stored in the yarn selection guides 27 a to 27 jexcept for the yarn selection guide 27 h can be used. In the case (2)where the yarn exchanging is performed from the yarn guide 6 b to theyarn guide 6 a, idle running of the yarn guide 6 b is completelyprevented as compared with the conventional mode where after the yarnguide 6 a has made one rotation of idle running, the yarn exchanging isperformed, so that a state that both the yarn guides 6 a and 6 b arewinding the yarns (so-called double winding) occurs during making final⅛ rotation. However, the double winding in such an extent does not causeany problem.

(3) The mode where the yarn removing operation and the yarn feedingoperation are simultaneously performed, for example, the first yarn 22 ais removed from the first yarn guide 6 a winding the first yarn 22 a andthe second yarn guide 6 b catches the second yarn 22 d is performed inthe following manner. The first yarn 22 a is removed from the first yarnguide 6 a winding the first yarn guide 22 a on the warper drum 208 byhaving the first yarn 22 a caught on a yarn removing guide, for example,the yarn removing guide 136 a, and the first yarn 22 a is passed andstored to a corresponding yarn selection guide 27 a. Simultaneouslytherewith, the second yarn 22 d is fed from the yarn selection guide 27d storing the second yarn 22 d to the second yarn guide 6 b and thesecond yarn 22 d is wound on the warper drum 208 in a state that thesecond yarn 22 d has been held by the second yarn guide 6 b. In thiscase, it is required that the width L₁ of the arc formed by the firstyarn guide 6 a and the second yarn guide 6 b and the installation widthL_(d) between the yarn selection guides 27 a and 27 d are approximatelyequal to each other, namely, L₁=L_(d) such that the yarn 22 a can beremoved from the first yarn guide 6 a and the yarn 22 d can be fed tothe second yarn guide 6 b.

In the above-described mode (3), besides the arrangement of the yarnselection device 27 illustrated in FIG. 3 and FIG. 8, it is preferableto employ arrangement where the yarn selection device 27 are grouped toa plurality of groups (the device is grouped into a first yarn selectiongroup 27A and a second yarn selection group 27 b), as illustrated inFIG. 9. The first yarn selection device 27A is provided with the yarnselection guides 27 a to 27 e and the second yarn selection device 27Bis provided with the yarn selection guides 27 f to 27 j. When aninstallation angle (45° in FIG. 9) between the two yarn selectiondevices 27A and 27B is set to be equal to an angle formed by adjacentyarn guides of the yarn guides 6 a to 6 h (in case of eight yarn guides,an angle formed by adjacent yarn guides, for example, by the yarn guides6 a and 6 b, is 45°), the space between the yarn guides 6 a and 6 b canbe coincident with the space between the yarn selection devices 27A and27B. With such a constitution, it is easy to perform the yarn removingoperation from the yarn guide 6 a and the yarn feeding operation to theyarn guide 6 b like the mode (3). In case that the yarn removingoperation and the yarn feeding operation are simultaneously performed inthis manner, idle running of the yarn guide 6 a is completely prevented,so that ideal yarn exchanging is performed. Incidentally, even if theconstitution shown in FIG. 9 where the yarn selection device 27 has beengrouped into groups is employed, of course, such a constitution can beapplied to the case that the yarn removing operation and the yarnfeeding operation are sequentially performed like the modes (1) and (2).

1. A sample warper with an idle running preventing mechanism of a yarnguide comprising: a plurality of yarn guides each rotatably mounted on aside surface of a warper drum for winding yarns on the warper drum; ayarn selection device provided with a plurality of yarn selection guideswhich are in correspondence with the yarn guides, each of the yarnselection guides being pivotally moved to project to a yarn exchangingposition when exchanging yarns and retract to a standby position whenstoring yarns; a fixed creel for supporting a plurality of bobbins onwhich the same kind and/or different kinds of yarns are to be wound andwhich are associated with the plural yarn selection guides; and yarnremoving guides which are provided such that one of the yarn removingguides corresponds to each of the plural yarn selection guide, whereinyarns are automatically exchanged and successively wound on the warperdrum according to a preset yarn order by passing the yarns between theyarn guides and the yarn selection guides, and wherein, when a firstyarn being wound on the warper drum by a first yarn guide is exchangedto a second yarn, after a yarn removing operation for removing the firstyarn from the first yarn guide is finished, a yarn feeding operation forfeeding the second yarn to a second yarn guide is performed while theempty first yarn guide makes one rotation.
 2. The sample warperaccording to claim 1, wherein, when yarn exchanging is performed from ayarn of the yarn selection guide positioned downstream of the yarnselection device to a yarn of the yarn selection guide positionedupstream of the yarn selection device, the yarn guide positioneddownstream of the first yarn guide is used as the second yarn guide. 3.The sample warper according to claim 1 or 2, wherein, after a yarnremoving operation for removing the first yarn from the first yarn guideis finished, a yarn guide which has first reached the position of theyarn selection guide which supplies the second yarn is used as thesecond yarn guide.
 4. A sample warper with an idle running preventingmechanism of a yarn guide comprising: a plurality of yarn guides eachrotatably mounted on a side surface of a warper drum for winding yarnson the warper drum; a yarn selection device provided with a plurality ofyarn selection guides which are in correspondence with the yarn guides,each of the yarn selection guides being pivotally moved to project to ayarn exchanging position when exchanging yarns and retract to a standbyposition when storing yarns; a fixed creel for supporting a plurality ofbobbins on which the same kind and/or different kinds of yarns are to bewound and which are associated with the plural yarn selection guides;and yarn removing guides which are provided such that one of the yarnremoving guides corresponds to each of the plural yarn selection guide,wherein yarns are automatically exchanged and successively wound on thewarper drum according to a preset yarn order by passing the yarnsbetween the yarn guides and the yarn selection guides, and wherein, whena first yarn being wound on the warper drum by a first yarn guide isexchanged to a second yarn, after a yarn feeding operation for feedingthe second yarn to a second yarn guide is finished, a yarn removingoperation for removing the first yarn from the first yarn guide isperformed while the second yarn guide holding the second yarn makes onerotation.
 5. The sample warper according to claim 4, wherein, when yarnexchanging is performed from a yarn of the yarn selection guidepositioned upstream of the yarn selection device to a yarn of the yarnselection guide positioned downstream of the yarn selection device, theyarn guide positioned upstream of the first yarn guide is used as thesecond yarn guide.
 6. The sample warper according to claim 4, wherein ayarn guide positioned upstream in a rotational direction of and adjacentto the first yarn guide is used as the second yarn guide.
 7. A samplewarper with an idle running preventing mechanism of a yarn guidecomprising: a plurality of yarn guides each rotatably mounted on a sidesurface of a warper drum for winding yarns on the warper drum; a yarnselection device provided with a plurality of yarn selection guideswhich are in correspondence with the yarn guides, each of the yarnselection guides being pivotally moved to project to a yarn exchangingposition when exchanging yarns and retract to a standby position whenstoring yarns; a fixed creel for supporting a plurality of bobbins onwhich the same kind and/or different kinds of yarns are to be wound andwhich are associated with the plural yarn selection guides; and yarnremoving guides which are provided such that one of the yarn removingguides corresponds to each of the plural yarn selection guide, whereinyarns are automatically exchanged and successively wound on the warperdrum according to a preset yarn order by passing the yarns between theyarn guides and the yarn selection guides, and wherein, when a firstyarn being wound on the warper drum by a first yarn guide is exchangedto a second yarn, a yarn removing operation for removing the first yarnfrom the first yarn guide and a yarn feeding operation for feeding thesecond yarn to a second yarn guide are performed simultaneously.
 8. Thesample warper according to claim 1, wherein the yarn selection guidesare grouped into a plurality of groups and arranged.
 9. The samplewarper according to claim 4, wherein the yarn selection guides aregrouped into a plurality of groups and arranged.
 10. The sample warperaccording to claim 7, wherein the yarn selection guides are grouped intoa plurality of groups and arranged.
 11. The sample warper according toclaim 8, wherein the grouped yarn selection guides are arrangedaccording to spaces among the plural yarn guides.
 12. The sample warperaccording to claim 9, wherein the grouped yarn selection guides arearranged according to spaces among the plural yarn guides.
 13. Thesample warper according to claim 10, wherein the grouped yarn selectionguides are arranged according to spaces among the plural yarn guides.14. A high speed warping method using the sample warper according toclaim 1, wherein a time period required for the yarn exchanging isreduced to the minimum.
 15. A high speed warping method using the samplewarper according to claim 4, wherein a time period required for the yarnexchanging is reduced to the minimum.
 16. A high speed warping methodusing the sample warper according to claim 7, wherein a time periodrequired for the yarn exchanging is reduced to the minimum.